Over the past few years we are seeing a gradual shift from websites using HTTP (Hypertext Transfer Protocol) to HTTPS (Hypertext Transfer Protocol Secure). HTTPS protocol enables secure connections and also brings potential positive SEO implications. ​

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However, there'​s one major problem with the move: when a site using HTTPS refers traffic to a site that’s not using HTTPS, the HTTP Referrer header is lost - no referral data is sent along. ​

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In other words, all traffic going from a trade with an HTTPS site to a trade with an HTTP site will be counted under ''​No referrer''​. The webmaster of the HTTPS site will have to take specific measures, so that traffic is tracked correctly on the HTTP site:

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* Add ''<​meta name="​referrer"​ content="​unsafe-url">''​ in the ''<​head>''​ section of your HTML. This will enable you to send the complete referrer information with the request. \\ \\